Compilare: user.c: In function 'xor': user.c:16: warning: suggest parentheses around + or - inside shift user.c:16: warning: suggest parentheses around + or - inside shift user.c:19: warning: suggest parentheses around + or - inside shift user.c:21: warning: suggest parentheses around + or - inside shift user.c: In function 'main': user.c:45: warning: format '%d' expects type 'int *', but argument 3 has type 'long int *' user.c:29: warning: unused variable 'end' user.c:30: warning: 'stop' may be used uninitialized in this function user.c:30: warning: 'start' may be used uninitialized in this function